visualising sound can be difficult, here someone has recorded a sound and tracked the sound waves and digitally visualised what these would look like, a very interesting out come and very aesthetically pleasing visuals the sound waves make.

Utilitarianism -- chủ nghĩa Thực dụng, is an ethical theory which states that the best action is the one that maximizes utility. "Utility" is defined in various ways, usually in terms of the well-being of sentient entities.